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Did the animal move? A cross-wavelet approach to geolocation data reveals year-round whereabouts of a resident seabird

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Abstract

Considerable progress in our understanding of long-distance migration has been achieved thanks to the use of small geolocator devices (GLS). The tracking of resident or short-distance migrant animals remains however challenging because geolocation errors are substantial and difficult to estimate. This study aims to examine the sex-specific marine space uses of a resident tropical seabird, the masked booby (Sula dactylatra), during its full annual life cycle at the Fernando de Noronha archipelago (Brazil). Masked boobies (n = 31) tagged with GLS recording light intensity, seawater immersion, and water temperature showed a resident behaviour over their entire annual cycle. A wavelet analysis of GLS data revealed oscillatory patterns of inferred longitude correlated with changes in immersion frequency. This synchronicity demonstrated that birds traveled away and back from the colony on consecutive trips of short length (\(\sim\) 2–4 days) and short range (\(\sim\) 100–300 km) eastward of the colony. Duration and range of trips depended on the sex of the individual and on the time of the year. Trip duration increased gradually from the end of the breeding period to the post-breeding period, probably due to the release of the central-place breeding constraints. During the pre-breeding period, females had farther ranges eastward and spent more time in water than males. Despite inherent limits of light-based geolocation, this study demonstrates the relevance of synchronicity analysis of GLS data for investigating year-round movements of resident or short-distance migrants.

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Data/Code availability

Data and code are available on our github page: https://github.com/AmedeeRoy/WaveLightGLS.

Notes

  1. https://resources.marine.copernicus.eu/(productidentifierSST_GLO_SST_L4_REP_OBSERVATIONS_010_001).

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Acknowledgements

We would like to thank all people involved in the fieldwork activities. Fieldwork activities received the administrative and logistical support from the Fernando de Noronha administration, the Instituto Chico Mendes de Conservação da Biodiversidade (ICMBio, Brazil), the military firemen from Fernando de Noronha and the TAMAR Project. We also want to express grateful thanks to anonymous reviewers and to colleagues from IFREMER and IRD for having helped us significantly on the manuscript.

Funding

This work is a contribution to the TRIATLAS project (funding by the European Union’s Horizon 2020 research and innovation program—Grant agreement No. 817578). This project has received funding from the Paddle Rise project—European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 734271. This study was partially funded by IRD (Mixed International Laboratory Tapioca), CPER Celimer (France), Fundação O Boticário (Brazil), Young Team IRD Programm Tabasco (JEAI) and Brazilian National Research Council (CNPq, No. 422759/2016-3). L.B. is research fellow from CNPq (PQ 311409/2018-0).

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Authors and Affiliations

Authors

Contributions

AR, SB and KD conceived the ideas and AR performed the analysis; AR, GT, KD, CB, KD and SB have been on fieldworks for collecting the data; AR led the writing of the manuscript. All authors contributed critically to the drafts and gave final approval for publication.

Corresponding author

Correspondence to Amédée Roy.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This work was conducted with the approval of the Brazilian Ministry of Environment—Instituto Chico Mendes de Conservação da Biodiversidade (Authorization No 52583-5).

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Reviewers: undisclosed experts.

Responsible Editor: V. Paiva.

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Roy, A., Delord, K., Nunes, G.T. et al. Did the animal move? A cross-wavelet approach to geolocation data reveals year-round whereabouts of a resident seabird. Mar Biol 168, 114 (2021). https://doi.org/10.1007/s00227-021-03923-x

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  • DOI: https://doi.org/10.1007/s00227-021-03923-x

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